1 /* 2 * hvconsole.c 3 * Copyright (C) 2004 Hollis Blanchard, IBM Corporation 4 * Copyright (C) 2004 IBM Corporation 5 * 6 * Additional Author(s): 7 * Ryan S. Arnold <rsa@us.ibm.com> 8 * 9 * LPAR console support. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 24 */ 25 26 #include <linux/kernel.h> 27 #include <linux/export.h> 28 #include <linux/errno.h> 29 #include <asm/hvcall.h> 30 #include <asm/hvconsole.h> 31 #include "plpar_wrappers.h" 32 33 /** 34 * hvc_get_chars - retrieve characters from firmware for denoted vterm adatper 35 * @vtermno: The vtermno or unit_address of the adapter from which to fetch the 36 * data. 37 * @buf: The character buffer into which to put the character data fetched from 38 * firmware. 39 * @count: not used? 40 */ 41 int hvc_get_chars(uint32_t vtermno, char *buf, int count) 42 { 43 unsigned long got; 44 45 if (plpar_get_term_char(vtermno, &got, buf) == H_SUCCESS) 46 return got; 47 48 return 0; 49 } 50 51 EXPORT_SYMBOL(hvc_get_chars); 52 53 54 /** 55 * hvc_put_chars: send characters to firmware for denoted vterm adapter 56 * @vtermno: The vtermno or unit_address of the adapter from which the data 57 * originated. 58 * @buf: The character buffer that contains the character data to send to 59 * firmware. 60 * @count: Send this number of characters. 61 */ 62 int hvc_put_chars(uint32_t vtermno, const char *buf, int count) 63 { 64 unsigned long *lbuf = (unsigned long *) buf; 65 long ret; 66 67 68 /* hcall will ret H_PARAMETER if 'count' exceeds firmware max.*/ 69 if (count > MAX_VIO_PUT_CHARS) 70 count = MAX_VIO_PUT_CHARS; 71 72 ret = plpar_hcall_norets(H_PUT_TERM_CHAR, vtermno, count, lbuf[0], 73 lbuf[1]); 74 if (ret == H_SUCCESS) 75 return count; 76 if (ret == H_BUSY) 77 return -EAGAIN; 78 return -EIO; 79 } 80 81 EXPORT_SYMBOL(hvc_put_chars); 82